EP0271167B1 - Method for adjusting the gap of two magnetic heads arranged on a head wheel, and head wheel with two magnetic heads arranged on it - Google Patents

Method for adjusting the gap of two magnetic heads arranged on a head wheel, and head wheel with two magnetic heads arranged on it Download PDF

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Publication number
EP0271167B1
EP0271167B1 EP87202453A EP87202453A EP0271167B1 EP 0271167 B1 EP0271167 B1 EP 0271167B1 EP 87202453 A EP87202453 A EP 87202453A EP 87202453 A EP87202453 A EP 87202453A EP 0271167 B1 EP0271167 B1 EP 0271167B1
Authority
EP
European Patent Office
Prior art keywords
head
magnetic heads
supporting plate
magnetic
basic portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87202453A
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German (de)
French (fr)
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EP0271167A3 (en
EP0271167A2 (en
Inventor
Wolfgang Binder-Kriegelstein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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Publication date
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0271167A2 publication Critical patent/EP0271167A2/en
Publication of EP0271167A3 publication Critical patent/EP0271167A3/en
Application granted granted Critical
Publication of EP0271167B1 publication Critical patent/EP0271167B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/56—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head support for the purpose of adjusting the position of the head relative to the record carrier, e.g. manual adjustment for azimuth correction or track centering
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
    • G11B5/53—Disposition or mounting of heads on rotating support

Definitions

  • the invention relates to a method for adjusting the gap of two magnetic heads arranged on a head disc, which lie next to one another in one plane and are arranged on the head disc, which can be driven in rotation, by means of a carrier plate common to them, the carrier plate being provided with a slot at one end , whereby two tabs projecting from a base part of the carrier plate are formed, at the free ends of which one of the two magnetic heads is attached to the same side surface of the tab, after which the carrier plate is fastened with its base part to the head plate and then the two magnetic heads with their on the gap width in relation to the head disc can be adjusted to a predetermined level.
  • a carrier plate known from DE-OS 31 21 791, which has two tabs projecting from a base part, at the free ends of which one of the two magnetic heads is attached to the same side surface of the tab, for adjusting the gap centers relative to the head width in Relative to a predetermined level with respect to a head plate, there is a threaded hole on each of the two tabs, into each of which an adjusting screw cooperating with the head plate can be screwed.
  • the base part of the carrier plate is used to attach the carrier plate to the head plate. In this way, the positions of the column of the two magnetic heads can each be adjusted individually.
  • Such a head disk which can be driven in rotation with two magnetic heads arranged on it, is used for recording or reproducing signals in very narrow adjacent tracks on a tape-shaped recording medium. Accordingly, the dimensions of such magnetic heads are known to be relatively small, which also applies to the carrier plate with the two flaps lying next to one another.
  • the provision of two adjuster screws lying close together, between one of the two lobes and the head plate are effective, because of the smallness of the carrier plate or the lobes of the same, for constructional reasons, causes constructional difficulties, and a very precise adjustment is also to be achieved.
  • the invention has set itself the goal of designing an above-mentioned method for adjusting the gap of two magnetic heads arranged on a head disc in such a way that it is particularly simple and precise and does not involve any structural difficulties.
  • the two magnetic heads attached to the lobes of the carrier plate measure on the carrier plate with respect to the distance of their gap centers, which are related to the head width, from the side surface of the base part of the carrier plate which corresponds to the side surfaces of the lobes of the carrier plate and which correspond to the magnetic heads
  • the magnetic head is determined with the smaller distance, after which, with the base part of the carrier plate held in place, such a pressure is exerted with a notching tool on the transition region of the flap carrying the magnetic head with the smaller distance to the base part of the carrier plate, from the side facing away from the magnetic head is that the flap is essentially bent as a whole until the center of the gap in relation to the head width of the magnetic head arranged on it is at the same level as that on the gap the width-related gap center of the magnetic
  • the two magnetic heads are first with their on the Head width related gap centers with respect to a reference surface of the base part of the support plate brought to the same level and then adjusted after assembly of the support plate on the head plate with an adjusting screw effective between the base part and the head plate to the predetermined level relative to the head plate.
  • an adjusting screw effective between the base part and the head plate to the predetermined level relative to the head plate.
  • the invention relates to a head disc with two magnetic heads arranged on it, which lie next to one another in a plane and are arranged by means of a common support plate on the head disc which can be driven in rotation during operation, the gap centers relating to the head width of the Column of the two magnetic heads are adjusted to a predetermined level with respect to the head disc.
  • Fig. 1 shows a side view of a head disc as used in operation.
  • Figure 2 shows a top view of a carrier plate with two lobes, at the free ends of which a magnetic head is attached.
  • 3 shows a section of the carrier plate according to FIG. 2 along the line III-III in FIG. 2.
  • 4 shows a section of the carrier plate according to FIG. 2 along the line IV-IV in FIG. 2.
  • 5 shows a schematic plan view of the running surfaces of the two magnetic heads before their gap centers, which are related to the head width, have been brought to the same level.
  • Fig. 6 shows in the same representation as Fig.
  • FIG. 7 shows in section a head plate with the carrier plate mounted on it according to Fig. 2, the hiebei in Section along the line IV-IV is shown in Fig.2. 8 shows a side view of an adjusting device as used in the course of carrying out the method according to the invention. It should be mentioned that, due to the small size of the magnetic heads in practice, the drawings are not to scale.
  • 1 denotes the chassis of a recording and / or reproducing device on which a stationary drum 2 is arranged.
  • a drive shaft 3 Coaxial to this drum 2 is a drive shaft 3 which can be driven by a motor and on which a head disc 4 having the same diameter as the drum 2 is clamped.
  • the head disc 4 is arranged on the drive shaft 3 so that there is a narrow gap between it and the drum 2, in the area of which the magnetic heads arranged on the head disc 4 with a section helically extending around the lateral surfaces of the drum 2 and the head disc 4 band-shaped recording medium 5 cooperate, wherein they scan on the same inclined, adjacent tracks.
  • two diametrically opposite carrier plates 6 are arranged on the head disc 4, which support the magnetic heads.
  • two magnetic heads are arranged on at least one carrier plate 6, which lie side by side in one plane, with their gap centers relative to the head width having to be exactly at a predetermined level with respect to the head plate 4 so that the Traces on the record carrier are scanned correctly.
  • adjustment measures for the magnetic heads are often required.
  • FIGS. 2, 3 and 4 now show such a carrier plate 6, which is provided with a slot 7 at one end, as a result of which two tabs 9 and 10 projecting from a base part 8 of the carrier plate are formed, each having a magnetic head at the free ends thereof 11 or 12 is attached.
  • the two magnetic heads 11 and 12 are arranged on the same side surfaces 13 and 14 of the tabs 9 and 10, so that they lie side by side in one plane.
  • the two magnetic heads 11 and 12 are constructed in the usual way by having two legs provided with windings, forming a magnetic circuit, which together form at their free end a running surface 15 or 16, into which an air gap of the magnetic circuit opens. In operation, these treads 15 and 16 of the two magnetic heads 11 and 12 interact with the recording medium 5.
  • the base part 8 of the carrier plate 6 is used to fasten the same to the head plate 4, the side surface 17 of the base part 8 of the carrier plate 6, which level matches the side surfaces 13 and 14 of the tabs 9 and 10 of the carrier plate and which carries the magnetic heads 11 and 12, forming a reference surface, with which the support plate is mounted facing the head disc, as shown in Fig.7.
  • gaps for short
  • FIG. 5 shows schematically a view of the running surfaces 15 and 16 of the two magnetic heads 11 and 12 in their position on an adjusting device shown in FIG.
  • the carrier plate 6 is hereby placed with the side surface 17 of its base part 8 forming the reference surface on a table 18 of the adjusting device and held there with a clamping device 20 which can be actuated by a lever 19, the tabs 9 and 10 carrying the magnetic heads 11 and 12 being freely over protrude the table 18.
  • the magnetic heads 11 and 12 lie opposite a microscope 21 to which a viewing device 22 is connected, so that their running surfaces 15 and 16 can be observed.
  • the height of the microscope 21 is adjusted with an adjusting device 23 such that a scale mark coincides with the side surface 17 of the base part 8 of the support plate 6 forming the reference surface or the contact surface of the table 18.
  • This reference surface is indicated in Figure 5 by a hatched line 24.
  • Microscope 21 is set transversely to the magnetic heads 11 and 12 on one of the two magnetic heads and the image appearing on the display device 22 is focused using a third setting device 26.
  • an eccentric 28 which can be actuated by a lever 27 and which acts on a slide 29, the microscope 21 can then be brought into a second position in the direction transverse to the magnetic heads, in which the other magnetic head is visible.
  • the gap opening into the running surface 15 of the magnetic head 11, which here has a predetermined azimuth angle as usual, but which is not absolutely necessary, is designated by 30, the gap width being defined in a known manner by lateral recesses 31 and 32 .
  • the magnetic head 12, the gap of which is designated by 33, and the recesses delimiting the gap width have the same reference numerals 34 and 35.
  • this difference in the levels of the gap centers of the two magnetic heads is initially compensated for.
  • the adjustment device 8 with the microscope 21 measure the gap centers of the two magnetic heads 11 and 12 with regard to their distance from the side surface 17 of the base part 8 of the carrier plate 6 forming the reference surface, the magnetic head being determined with the smaller distance. In the present case, this is the magnetic head 11.
  • the flap 9 has essentially been kinked as a whole, a notch 37 having formed in the transition region from the flap 9 to the base part 8 of the carrier plate 6, due to the pressure exerted on this transition region by the notching tool 36 between the tab 9 and the base part 8 of the carrier plate 6. It is important that the tab 9 is kinked essentially as a whole so that its side surface 13 carrying the magnetic head 11 is not deformed, which could lead to damage to the magnetic head.
  • two notching tools 36 are provided one behind the other in the view of this figure, each of which one of the two transition regions between the tabs 9 and 10 to the base part 8 of the carrier plate 6, from the side facing away from the magnetic heads 11 and 12 , is opposite, each of which can be actuated by a lever 38 or 39 in order to apply the required pressure.
  • the notching tools are designed in the form of blades and extend essentially across the entire transition areas.
  • the carrier plate is attached to the aforementioned reference surface of the head plate 4, as shown in FIG. 7 shows.
  • the attachment is chosen so that it takes place in a region of the base part 8 of the carrier plate 6 which essentially faces away from the tabs 9 and 10, so that the remaining section of the carrier plate is not held in place.
  • this fastening takes place with a screw 40 which projects through a bore 41 in the base part 8 of the carrier plate 6 and engages in a threaded bore 42 on the head plate 4.
  • Hiebei a recess 43 is provided in the head plate for exempting the magnetic heads 11 and 12, the flaps 9 and 10 carrying these and the flaps 9 and 10 essentially facing this region of the base part 8 of the carrier plate 6, so that these parts project freely.
  • the gap centers of the two magnetic heads 11 and 12 are thus at a level at a distance b from the side surface 17 of the base part 8 of the carrier plate 6 forming the reference surface, which is in contact with the lateral boundary surface 44 of the head plate 44 coincides, on which the carrier plate 6 is attached. It is now assumed that the predetermined level relative to the head disc 4, to which the gap centers of the two magnetic heads 11 and 12 are to be adjusted, should be at a distance d from the lateral boundary surface 44 of the head disc 4, as is indicated in FIG .
  • rotatable adjusting screw 46 is provided, which cooperates with its free end with the area of the base part 8 of the carrier plate 6 essentially facing the tabs 9 and 10.
  • adjusting screw 46 is actuated by bending this area of the base part 8 of the support plate 6, the two tabs 9 and 10 also being adjusted uniformly, both magnetic heads together with their gap centers on the at a distance d from the lateral boundary surface 44 of the head plate 4 lying predetermined levels adjustable.
  • only one adjusting screw 46 is required, which interacts with the base part 8 of the carrier plate 6, which is wider than the tabs 9 and 10, which can be implemented easily and without space problems.
  • the essence of the present method is thus that first the gap centers of both magnetic heads are brought to the same level with respect to a reference surface of the carrier plate and then, after the carrier plate has been fastened to the head plate, are adjusted together with the adjusting screw to the predetermined level relative to the head slide.

Landscapes

  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Magnetic Heads (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Justieren der Spalte von zwei auf einer Kopfscheibe angeordneten Magnetköpfen, die in einer Ebene nebeneinander liegen und mittels eines ihnen gemeinsamen Trägerplättchens auf der im Betrieb rotierend antreibbaren Kopscheibe angeordnet werden, wobei das Trägerplättchen an einem Ende mit einem Schlitz versehen wird, wodurch zwei von einem Basisteil des Trägerplättchens auskragende Lappen gebildet werden, an deren freien Enden je einer der beiden Magnetköpfe an der gleichen Seitenfläche der Lappen angebracht wird, wonach das Trägerplättchen mit seinem Basisteil an der Kopfscheibe befestigt wird und danach die beiden Magnetköpfe mit ihren auf die Kopfbreite bezogenen Spaltmitten in Bezug auf die Kopfscheibe auf ein vorgegebenes Niveau justiert werden. Bei einem aus der DE-OS 31 21 791 bekannten Trägerplättchen, das zwei von einem Basisteil auskragende Lappen aufweist, an deren freien Enden je einer der beiden Magnetköpfe an der gleichen Seitenfläche der Lappen angebracht ist, ist zum Justieren der auf die Kopfbreite bezogenen Spaltmitten in Bezug auf ein vorgegebenes Niveau gegenüber einer Kopfscheibe vorgesehen, daß auf jedem der beiden Lappen eine Gewindebohrung angebracht ist, in welche je eine mit der Kopfscheibe zusammenwirkende Justierschraube einschraubbar ist. Der Basisteil des Trägerplättchens dient dabei zur Befestigung des Trägerplättchens an der Kopfscheibe. Auf diese Weise sind die Lagen der Spalte der beiden Magnetköpfe je für sich justierbar. Eine derartige im Betrieb rotierend antreibbare Kopfscheibe mit zwei auf ihr angeordneten Magnetköpfen dient zur Aufzeichnung bzw. Wiedergabe von Signalen in sehr schmalen nebeneinander liegenden Spuren auf einem bandförmigen Aufzeichnungsträger. Demgemäß sind bekanntlich die Abmessungen derartiger Magnetköpfe relativ klein, was damit auch für das Trägerplättchen mit den beiden nebeneinander leigenden Lappen gilt. Das Vorsehen von zwei knapp nebeneinander liegenden Justierschrauben, die zwischen je einem der beiden Lappen und der Kopfscheibe wirksam sind, macht wegen der Kleinheit des Trägerplättchens beziehungsweise der Lappen desselben aus Platzgründen konstruktive Schwierigkeiten, wobei auch noch ein sehr genaues Justieren erreicht werden soll.The invention relates to a method for adjusting the gap of two magnetic heads arranged on a head disc, which lie next to one another in one plane and are arranged on the head disc, which can be driven in rotation, by means of a carrier plate common to them, the carrier plate being provided with a slot at one end , whereby two tabs projecting from a base part of the carrier plate are formed, at the free ends of which one of the two magnetic heads is attached to the same side surface of the tab, after which the carrier plate is fastened with its base part to the head plate and then the two magnetic heads with their on the gap width in relation to the head disc can be adjusted to a predetermined level. In a carrier plate known from DE-OS 31 21 791, which has two tabs projecting from a base part, at the free ends of which one of the two magnetic heads is attached to the same side surface of the tab, for adjusting the gap centers relative to the head width in Relative to a predetermined level with respect to a head plate, there is a threaded hole on each of the two tabs, into each of which an adjusting screw cooperating with the head plate can be screwed. The base part of the carrier plate is used to attach the carrier plate to the head plate. In this way, the positions of the column of the two magnetic heads can each be adjusted individually. Such a head disk, which can be driven in rotation with two magnetic heads arranged on it, is used for recording or reproducing signals in very narrow adjacent tracks on a tape-shaped recording medium. Accordingly, the dimensions of such magnetic heads are known to be relatively small, which also applies to the carrier plate with the two flaps lying next to one another. The provision of two adjuster screws lying close together, between one of the two lobes and the head plate are effective, because of the smallness of the carrier plate or the lobes of the same, for constructional reasons, causes constructional difficulties, and a very precise adjustment is also to be achieved.

Die Erfindung hat sich zum Ziel gesetzt, ein wie eingangs angeführtes Verfahren zum Justieren der Spalte von zwei auf einer Kopfscheibe angeordneten Magnetköpfen so auszugestalten, daß es besonders einfach und genau ist und keine konstruktiven Schwierigkeiten mit sich bringt. Erfindungsgemäß ist hiezu vorgesehen, daß die beiden auf den Lappen des Trägerplättchens angebrachten Magnetköpfe am Trägerplättchen hinsichtlich des Abstandes ihrer auf die Kopfbreite bezogenen Spaltmitten von der eine Bezugsfläche bildenden, mit den die Magnetköpfe tragenden Seitenflächen der Lappen des Trägerplättchens niveaumäßig übereinstimmende Seitenfläche des Basisteiles des Trägerplättchens vermessen werden, wobei der Magnetkopf mit dem kleineren Abstand festgestellt wird, wonach bei festgehaltenem Basisteil des Trägerplättchens auf den Übergangsbereich des den Magnetkopf mit dem kleineren Abstand tragenden Lappens zum Basisteil des Trägerplättchens, von der dem Magnetkopf abgewandten Seite her, mit einem Kerbwerkzeug ein solcher Druck ausgeübt wird, daß der Lappen im wesentlichen als Ganzes so weit abgeknickt wird, bis die auf die Kopfbreite bezogene Spaltmitte des auf ihm angeordneten Magnetkopfes auf dem gleichen Niveau liegt, wie die auf die Spaltbreite bezogene Spaltmitte des auf dem anderen Lappen angeordneten Magnetkopfes, daß danach Trägerplättchen mit der die Bezugsfläche bildenden Seitenfläche des Basisteiles der Kopfscheibe zugewandt, mit dem im wesentlichen von den Lappen abgewandten Bereich des Basisteiles an der Kopfscheibe befestigt wird, wonach mit einer zwischen dem in wesentlichen den Lappen zugewandten Bereich des Basisteiles des Trägerplättchens und der Kopfscheibe wirksamen Justierschraube durch Verbiegen dieses Bereiches des Basisteiles des Trägerplättchens beide Magnetköpfe gemeinsam mit ihren auf die Kopfbreite bezogenen Spaltmitten in Bezug auf die Kopfscheibe auf des vorgegebene Niveau justiert werden. Auf diese Weise werden die beiden Magnetköpfe zuerst mit ihren auf die Kopfbreite bezogenen Spaltmitten in Bezug auf eine Bezugsfläche des Basisteiles des Trägerplättchens auf gleiches Niveau gebracht und dann nach der Montage des Trägerplättchens an der Kopfscheibe mit einer zwischen dem Basisteil und der Kopfscheibe wirksamen Justierschraube gemeinsam auf das vorgegebene Niveau gegenüber der Kopfscheibe justiert. Somit ist nur eine einzige Justierschraube erforderlich, die mit dem gegenüber den beiden Lappen größerflächigeren Basisteil des Trägerplättchens zusammenwirkt, wodurch es aus Platzgründen keine konstruktiven Schwierigkeiten gibt. Mit einem derartigen Verfahren wird auch ein sehr genaues Justieren der Spalte auf das vorgegebene Niveau genenüber der Kopfscheibe erreicht.The invention has set itself the goal of designing an above-mentioned method for adjusting the gap of two magnetic heads arranged on a head disc in such a way that it is particularly simple and precise and does not involve any structural difficulties. According to the invention, the two magnetic heads attached to the lobes of the carrier plate measure on the carrier plate with respect to the distance of their gap centers, which are related to the head width, from the side surface of the base part of the carrier plate which corresponds to the side surfaces of the lobes of the carrier plate and which correspond to the magnetic heads The magnetic head is determined with the smaller distance, after which, with the base part of the carrier plate held in place, such a pressure is exerted with a notching tool on the transition region of the flap carrying the magnetic head with the smaller distance to the base part of the carrier plate, from the side facing away from the magnetic head is that the flap is essentially bent as a whole until the center of the gap in relation to the head width of the magnetic head arranged on it is at the same level as that on the gap the width-related gap center of the magnetic head arranged on the other tab, that support plate with the side surface of the base part of the base part of the base plate forming the reference surface is then attached to the head plate with the area of the base part essentially facing away from the tabs, after which with a between the substantially the area facing the flap of the base part of the support plate and the head plate effective adjusting screw by bending this area of the base part of the support plate both magnetic heads are adjusted together with their gap centers related to the head width with respect to the head plate to the predetermined level. In this way, the two magnetic heads are first with their on the Head width related gap centers with respect to a reference surface of the base part of the support plate brought to the same level and then adjusted after assembly of the support plate on the head plate with an adjusting screw effective between the base part and the head plate to the predetermined level relative to the head plate. Thus, only a single adjusting screw is required, which interacts with the base part of the carrier plate which has a larger surface area than the two tabs, so that there are no constructional difficulties for reasons of space. With such a method, a very precise adjustment of the gaps to the predetermined level genes above the head plate is achieved.

Weiters betrifft die Erfindung eine Kopfscheibe mit zwei auf ihr angeordneten Magnetköpfen, die in einer Ebene nebeneinander liegen und mittels eines ihnen gemeinsamen Trägeplättchens auf der im Betreibe rotierend antreibbaren Kopfscheibe angeordnet sind, wobei nach dem im vorstehenden angeführten erfindungsgemäßen Verfahren die auf die Kopfbreite bezogenen Spaltmitten der Spalte der beiden Magnetköpfe in Bezug auf die Kopfscheibe auf ein vorgegebenes Niveau justiert sind.Furthermore, the invention relates to a head disc with two magnetic heads arranged on it, which lie next to one another in a plane and are arranged by means of a common support plate on the head disc which can be driven in rotation during operation, the gap centers relating to the head width of the Column of the two magnetic heads are adjusted to a predetermined level with respect to the head disc.

Das erfindungsgemäße Verfahren und eine nach diesem Verfahren hergestellte erfindungsgemäße Kopfscheibe werden im folgenden anhand der Zeichnungen näher erläutert. Fig.1 zeigt in Seitenansicht eine Kopfscheibe wie sie im Betrieb verwendet wird. Fig.2 zeigt in Draufsicht ein Trägerplättchen mit zwei Lappen, an deren freien Enden je ein Magnetkopf angebracht ist. Fig.3 zeigt eine Schnitt des Trägerplättchens nach Fig.2 gemäß der Linie III-III in Fig.2. Fig.4 zeigt einen Schnitt des Trägerplättchens nach Fig.2 gemäß der Linie IV-IV in Fig.2. Fig.5 zeigt schematisch eine Draufsicht auf die Laufflächen der beiden Magnetköpfe, bevor ihre auf die Kopfbreite bezogenen Spaltmitten auf gleiches Niveau gebracht wurden. Fig.6 zeigt in der gleichen Darstellungsweise wie Fig.5 die beiden Magnetköpfe nach dem ihre auf die Kopfbreite bezogenen Spaltmitten auf gleiches Niveau gebracht wurden. Fig.7 zeigt im Schnitt eine Kopfscheibe mit dem auf ihr montierten Trägerplättchen nach Fig.2, das hiebei im Schnitt nach der Linie IV-IV in Fig.2 gezeigt ist. Fig.8 zeigt in Seitenansicht eine Justiervorrichtung wie sie im Zuge der Durchführung des erfindungsgemäßen Verfahrens verwendet wird. Es sei erwähnt, daß wegen der sich in der Praxis ergebenden Kleinheit der Magnetköpfe die Zeichnungen nicht maßstabsgetreu sind.The method according to the invention and a head disc according to the invention produced by this method are explained in more detail below with reference to the drawings. Fig. 1 shows a side view of a head disc as used in operation. Figure 2 shows a top view of a carrier plate with two lobes, at the free ends of which a magnetic head is attached. 3 shows a section of the carrier plate according to FIG. 2 along the line III-III in FIG. 2. 4 shows a section of the carrier plate according to FIG. 2 along the line IV-IV in FIG. 2. 5 shows a schematic plan view of the running surfaces of the two magnetic heads before their gap centers, which are related to the head width, have been brought to the same level. Fig. 6 shows in the same representation as Fig. 5 the two magnetic heads after their gap centers related to the head width were brought to the same level. Fig. 7 shows in section a head plate with the carrier plate mounted on it according to Fig. 2, the hiebei in Section along the line IV-IV is shown in Fig.2. 8 shows a side view of an adjusting device as used in the course of carrying out the method according to the invention. It should be mentioned that, due to the small size of the magnetic heads in practice, the drawings are not to scale.

In Fig.1 ist mit 1 das Chassis eines Aufzeichnungs- und/oder Wiedergabegerätes bezeichnet, auf dem eine stillstehende Trommel 2 angeordnet ist. Koaxial zu dieser Trommel 2 verläuft eine von einem Motor her antreibbare Antriebswelle 3, auf der eine einen gleichen Durchmesser wie die Trommel 2 aufweisende Kopfscheibe 4 klemmend befestigt ist. Die Kopfscheibe 4 ist dabei auf der Antriebswelle 3 so angeordnet, daß sich zwischen ihr und der Trommel 2 ein schmaler Spalt ergibt, in dessen Bereich die auf der Kopfscheibe 4 angeordneten Magnetköpfe mit einem abschnittsweise schraubenlinienförmig um die Mantelflächen der Trommel 2 und der Kopfscheibe 4 verlaufenden bandförmigen Aufzeichnungsträgers 5 zusammenwirken, wobei sie auf demselben schräg verlaufende, nebeneinander liegende Spuren abtasten. Im vorliegenden Fall ist angenommen, daß an der Kopfscheibe 4 zwei einander diametral gegenüberliegende Trägerplättchen 6 angeordnet sind, welche die Magnetköpfe tragen. Aus Gründen der Signalverarbeitung ist es dabei vielfach erforderlich, daß auf mindestens einem Trägerplättchen 6 zwei Magnetköpfe angeordnet sind, die in einer Ebene nebeneinander liegen, wobei sich ihre auf die Kopfbreite bezogenen Spaltmitten genau auf einem vorgegebenen Niveau gegenüber der Kopfscheibe 4 befinden müssen, damit die Spuren am Aufzeichnungsträger richtig abgetastet werden. Um dieser Anforderung gerecht zu werden, sind vielfach Justiermaßnahmen für die Magnetköpfe erforderlich.In Figure 1, 1 denotes the chassis of a recording and / or reproducing device on which a stationary drum 2 is arranged. Coaxial to this drum 2 is a drive shaft 3 which can be driven by a motor and on which a head disc 4 having the same diameter as the drum 2 is clamped. The head disc 4 is arranged on the drive shaft 3 so that there is a narrow gap between it and the drum 2, in the area of which the magnetic heads arranged on the head disc 4 with a section helically extending around the lateral surfaces of the drum 2 and the head disc 4 band-shaped recording medium 5 cooperate, wherein they scan on the same inclined, adjacent tracks. In the present case, it is assumed that two diametrically opposite carrier plates 6 are arranged on the head disc 4, which support the magnetic heads. For reasons of signal processing, it is often necessary that two magnetic heads are arranged on at least one carrier plate 6, which lie side by side in one plane, with their gap centers relative to the head width having to be exactly at a predetermined level with respect to the head plate 4 so that the Traces on the record carrier are scanned correctly. In order to meet this requirement, adjustment measures for the magnetic heads are often required.

In den Figuren 2, 3 und 4 ist nun ein solches Trägerplättchen 6 dargestellt, das an einem Ende mit einem Schlitz 7 versehen ist, wodurch zwei von einem Basisteil 8 des Trägerplättchens auskragende Lappen 9 und 10 gebildet werden, an deren freien Enden je ein Magnetkopf 11 bzw. 12 angebracht ist. Die beiden Magnetköpfe 11 und 12 sind dabei an gleichen Seitenflächen 13 bzw. 14 der Lappen 9 und 10 angeordnet, so daß sie in einer Ebene nebeneinander liegen. Aufgebaut sind die beiden Magnetköpfe 11 und 12 in üblicher Weise, indem sie zwei mit Wicklungen versehene, einen Magnetkreis bildende Schenkel aufweisen, die zusammen an ihrem freien Ende eine Lauffläche 15 bzw. 16 bilden, in die ein Luftspalt des Magnetkreises mündet. Im Betrieb wirken dies Laufflächen 15 und 16 der beiden Magnetköpfe 11 und 12 mit dem Aufzeichnungsträger 5 zusammen. Der Basisteil 8 des Trägerplättchens 6 dient zur Befestigung desselben an der Kopfscheibe 4, wobei die mit den die Magnetköpfe 11 und 12 tragenden Seitenflächen 13 und 14 der Lappen 9 und 10 des Trägerplättchens niveaumäßig übereinstimmende Seitenfläche 17 des Basisteiles 8 des Trägerplättchens 6 eine Bezugsfläche bildet, mit der das Trägerplättchen der Kopfscheibe zugewandt an dieser montiert wird, wie dies Fig.7 zeigt. Im Zuge der Herstellung der Magnetköpfe kann es dazu kommen, daß ihre auf die Kopfbreite bezogenen Spaltmitten der Luftspalte, im weiteren kurz Spalte genannt, gegenüber der durch die Seitenfläche 17 des Basisteiles 8 des Trägerplättchens 6 gebildeten Bezugsfläche ungleiche Abstände haben, was anhand der Fig.5 näher erläutert wird.FIGS. 2, 3 and 4 now show such a carrier plate 6, which is provided with a slot 7 at one end, as a result of which two tabs 9 and 10 projecting from a base part 8 of the carrier plate are formed, each having a magnetic head at the free ends thereof 11 or 12 is attached. The two magnetic heads 11 and 12 are arranged on the same side surfaces 13 and 14 of the tabs 9 and 10, so that they lie side by side in one plane. The two magnetic heads 11 and 12 are constructed in the usual way by having two legs provided with windings, forming a magnetic circuit, which together form at their free end a running surface 15 or 16, into which an air gap of the magnetic circuit opens. In operation, these treads 15 and 16 of the two magnetic heads 11 and 12 interact with the recording medium 5. The base part 8 of the carrier plate 6 is used to fasten the same to the head plate 4, the side surface 17 of the base part 8 of the carrier plate 6, which level matches the side surfaces 13 and 14 of the tabs 9 and 10 of the carrier plate and which carries the magnetic heads 11 and 12, forming a reference surface, with which the support plate is mounted facing the head disc, as shown in Fig.7. In the course of the manufacture of the magnetic heads, it can happen that their gap centers in relation to the head width of the air gaps, hereinafter referred to as gaps for short, have unequal distances from the reference surface formed by the side surface 17 of the base part 8 of the carrier plate 6, which is shown in FIG. 5 is explained in more detail.

Die Fig.5 zeigt schematisch eine Ansicht auf die Laufflächen 15 und 16 der beiden Magnetköpfe 11 und 12 in ihrer Lage auf einer in Fig.8 gezeigten Justiervorrichtung. Das Trägerplättchen 6 wird hiebei mit der die Bezugsfläche bildenden Seitenfläche 17 ihres Basisteiles 8 auf einen Tisch 18 der Justiervorrichtung aufgelegt und dort mit einer durch einen Hebel 19 betätigbaren Klemmvorrichtung 20 festgehalten, wobei, die die Magnetköpfe 11 und 12 tragenden Lappen 9 und 10 frei über den Tisch 18 hinausragen. Die Magnetköpfe 11 und 12 liegen dabei einem Mikroskop 21, an das ein Sichtgerät 22 angeschlossen ist, gegenüber, so daß ihre Laufflächen 15 und 16 beobachtbar sind. Das Mikroskop 21 wird dabei mit einer Einstellvorrichtung 23 höhenmäßig so eingestellt, daß eine Maßstabsmarke, mit der die Bezugsfläche bildenden Seitenfläche 17 des Basisteiles 8 des Trägerplättchens 6 bzw. der Auflagefläche des Tisches 18 übereinstimmt. Diese Bezugsfläche ist in Fig.5 durch eine mit einer Schraffur versehenen Linie 24 angedeutet. Mit einer zweiten Einstellvorrichtung 25 wird das Mikroskop 21 quer zu den Magnetköpfen 11 und 12 auf einen der beiden Magnetköpfe eingestellt und das am Sichtgerät 22 erscheinende Bild mit einer dritten Einstellvorrichtung 26 scharf eingestellt. Mit einem von einem Hebel 27 betätigbaren Exzenter 28, der auf einen Schlitten 29 einwirkt, kann dann das Mikroskop 21 in Richtung quer zu den Magnetköpfen in eine zweite Position gebracht werden, in der der andere Magnetkopf sichtbar ist.5 shows schematically a view of the running surfaces 15 and 16 of the two magnetic heads 11 and 12 in their position on an adjusting device shown in FIG. The carrier plate 6 is hereby placed with the side surface 17 of its base part 8 forming the reference surface on a table 18 of the adjusting device and held there with a clamping device 20 which can be actuated by a lever 19, the tabs 9 and 10 carrying the magnetic heads 11 and 12 being freely over protrude the table 18. The magnetic heads 11 and 12 lie opposite a microscope 21 to which a viewing device 22 is connected, so that their running surfaces 15 and 16 can be observed. The height of the microscope 21 is adjusted with an adjusting device 23 such that a scale mark coincides with the side surface 17 of the base part 8 of the support plate 6 forming the reference surface or the contact surface of the table 18. This reference surface is indicated in Figure 5 by a hatched line 24. With a second setting device 25 Microscope 21 is set transversely to the magnetic heads 11 and 12 on one of the two magnetic heads and the image appearing on the display device 22 is focused using a third setting device 26. With an eccentric 28 which can be actuated by a lever 27 and which acts on a slide 29, the microscope 21 can then be brought into a second position in the direction transverse to the magnetic heads, in which the other magnetic head is visible.

In Fig.5 ist der in die Lauffläche 15 des Magnetkopfes 11 mündende Spalt, der hier wie üblich einen vorgegebenen Azimutwinkel hat, was aber nicht zwingend notwendig ist, mit 30 bezeichnet, wobei durch seitliche Ausnehmungen 31 und 32 in bekannter Weise die Spaltbreite festgelegt ist. Analog dazu ist beim Magnetkopf 12, dessen Spalt mit 33 bezeichnet, und die die Spaltbreite begrenzenden Ausnehmungen tragen die Bezugszeichen 34 und 35. Bei der Herstellung der Magnetköpfe kann es beispielsweise dazu kommen, daß die Magnetköpfe ungleich breit sind oder daß die die Spaltbreite begrenzenden seitlichen Ausnehmungen bei an sich gleicher Spaltbreite der Magnetköpfe von Magnetkopf zu Magnetkopf auf unterschiedlichen Niveaus liegen. Derartige Einflüsse haben zur Folge, daß nach dem Anbringen der Magnetköpfe 11 und 12 an den Lappen 9 und 10 des Trägerplättchens 6 ihre auf die Kopfbreite bezogenen Spaltmitten, im folgenden kurz Spaltmitten genannt, gegenüber der die Bezugsfläche bildenden Seitenfläche 17 des Basisteiles 8 des Trägerplättchens 6 ungleichen Abstand haben. Beim vorliegenden Ausführungsbeispiel ist, wie aus Fig.5 ersichtlich ist, beispielsweise angenommen, daß der Magnetkopf 11 geringere Breite als der Magnetkopf 12 hat. Demgemäß hat die Spaltmitte des Magnetkopfes 11 den Abstand a von der durch die Linie 24 angedeuteten Bezugsfläche und die Spaltmitte des Magnetkopfes 12 den Abstand b von derselben, wobei a kleiner ist als b. Um die Differenz c zwischen a und b liegen daher die Spaltmitten der beiden Magnetköpfe 11 und 12 auf unterschiedlichen Niveaus gegenüber der durch die Linie 24 angedeuteten Bezugsfläche.In FIG. 5, the gap opening into the running surface 15 of the magnetic head 11, which here has a predetermined azimuth angle as usual, but which is not absolutely necessary, is designated by 30, the gap width being defined in a known manner by lateral recesses 31 and 32 . The magnetic head 12, the gap of which is designated by 33, and the recesses delimiting the gap width have the same reference numerals 34 and 35. During the manufacture of the magnetic heads, it can happen, for example, that the magnetic heads are unequally wide or that the lateral width limits the gap width Recesses with the same gap width of the magnetic heads from magnetic head to magnetic head are at different levels. Such influences have the consequence that, after the magnetic heads 11 and 12 have been attached to the tabs 9 and 10 of the carrier plate 6, their gap centers, referred to below as gap centers, relative to the head width, opposite the side surface 17 of the base part 8 of the carrier plate 6 forming the reference surface have an unequal distance. In the present exemplary embodiment, as can be seen from FIG. 5, it is assumed, for example, that the magnetic head 11 has a smaller width than the magnetic head 12. Accordingly, the gap center of the magnetic head 11 has the distance a from the reference surface indicated by the line 24 and the gap center of the magnetic head 12 has the distance b from the same, wherein a is smaller than b. By the difference c between a and b, the gap centers of the two magnetic heads 11 and 12 are therefore at different levels compared to the reference surface indicated by the line 24.

Gemäß dem vorliegenden Verfahren wird nun vorerst dieser Unterschied in den Niveaus der Spaltmitten der beiden Magnetköpfe ausgeglichen. Hiezu werden in der Justiervorrichtung nach Fig.8 mit dem Mikroskop 21 die Spaltmitten der beiden Magnetköpfe 11 und 12 hinsichtlich ihres Abstandes, von der die Bezugsfläche bildenden Seitenfläche 17 des Basisteiles 8 des Trägerplättchens 6 vermessen, wobei der Magnetkopf mit dem kleineren Abstand festgestellt wird. Im vorliegenden Fall ist dies der Magnetkopf 11. Bei mit der Klemmvorrichtung 20 am Basisteil 8 festgehaltenen Trägerplättchens 6 wird nun mit einem Kerbwerkzeug 36 auf den Übergangsbereich des den Magnetkopf 11 tragenden Lappens 9 zum Basisteil 8 des Trägerplättchens 6 von der dem Magnetkopf 11 abgewandten Seite her ein solcher Druck ausgeübt, daß der Lappen 9 als Ganzes so weit abgeknicht wird, bis die Spaltmitte des auf ihm angeordneten Magnetkopfes 11 auf dem gleichen Niveau liegt, wie die Spaltmitte des am anderen Lappen 10 angeordneten Magnetkopfes 12, was mit dem Mikroskop 21 festgestellt wird. Diese Situation zeigt Fig.6, gemäß welcher der Abstand a um den Betrag c gegenüber der durch die Linie 24 angedeuteten Bezugsfläche vergrößert wurde, so daß nunmehr die Spaltmitten beider Magnetköpfe 11 und 12 im Abstand b zur Bezugsfläche liegen. Aus Fig.4 ist dabei ersichtlich, daß der Lappen 9 im wesentlichen als Ganzes abgeknickt wurde, wobei sich im Übergangsbereich des Lappens 9 zum Basisteil 8 des Trägerplättchens 6 eine Kerbe 37 gebildet hat, dies zufolge des mit dem Kerbwerkzeug 36 ausgeübten Druckes auf diesen Übergangsbereich zwischen dem Lappen 9 und Basisteil 8 des Trägerplättchens 6. Wichtig ist dabei, daß der Lappen 9 im wesentlichen als Ganzes abgeknickt wird, damit seine den Magnetkopf 11 tragende Seitenfläche 13 nicht deformiert wird, was zu einer Beschädigung des Magnetkopfes führen könnte.According to the present method, this difference in the levels of the gap centers of the two magnetic heads is initially compensated for. For this purpose, in the adjustment device 8 with the microscope 21, measure the gap centers of the two magnetic heads 11 and 12 with regard to their distance from the side surface 17 of the base part 8 of the carrier plate 6 forming the reference surface, the magnetic head being determined with the smaller distance. In the present case, this is the magnetic head 11. When the carrier plate 6 is held on the base part 8 with the clamping device 20, a notching tool 36 is now used on the transition area of the tab 9 carrying the magnetic head 11 to the base part 8 of the carrier plate 6 from the side facing away from the magnetic head 11 such a pressure is exerted that the flap 9 as a whole is knocked off until the center of the gap of the magnetic head 11 arranged on it is at the same level as the center of the gap of the magnetic head 12 arranged on the other flap 10, which is determined with the microscope 21 . This situation is shown in FIG. 6, according to which the distance a has been increased by the amount c compared to the reference surface indicated by the line 24, so that the gap centers of both magnetic heads 11 and 12 are now at a distance b from the reference surface. It can be seen from FIG. 4 that the flap 9 has essentially been kinked as a whole, a notch 37 having formed in the transition region from the flap 9 to the base part 8 of the carrier plate 6, due to the pressure exerted on this transition region by the notching tool 36 between the tab 9 and the base part 8 of the carrier plate 6. It is important that the tab 9 is kinked essentially as a whole so that its side surface 13 carrying the magnetic head 11 is not deformed, which could lead to damage to the magnetic head.

Bei der Justiervorrichtung nach Fig.8 sind zwei in der Ansicht dieser Figur hintereinander liegende Kerbwerkzeuge 36 vorgesehen, von welchen jedes einem der beiden Übergangsbereiche zwischen den Lappen 9 und 10 zum Basisteil 8 des Trägerplättchens 6, von der den Magnetköpfen 11 und 12 abgewandten Seite her, gegenüberliegt, wobei jedes für sich mit einem Hebel 38 bzw. 39 betätigbar ist, um den erforderlichen Druck aufzubringen. Auf diese Weise ist keine Verstellung des Kerbwerkzeuges auf den jeweiligen Übergangsbereich, auf den Druck ausgeübt werden soll, erforderlich, sondern es wird einfach dasjenige Kerbwerkzeug betätigt, das dem übergangsbereich gegenüberliegt, auf den ein Druck auszuüben ist, um die Spaltmitten der beiden Magnetköpfe auf gleiches Niveau zu bringen. Die Kerbwerkzeuge sind im vorliegenden Fall schneidenförmig ausgebildet, und reichen im wesentlichen quer über die ganzen Übergangsbereiche. Selbstverständlich wäre es aber auch möglich, die Kerbwerkzeuge so ausbilden, daß nur lokal begrenzt Kerbwirkungen entstehen, beispielsweise an einigen Punkten des betreffenden Übergangsbereiches.In the adjusting device according to FIG. 8, two notching tools 36 are provided one behind the other in the view of this figure, each of which one of the two transition regions between the tabs 9 and 10 to the base part 8 of the carrier plate 6, from the side facing away from the magnetic heads 11 and 12 , is opposite, each of which can be actuated by a lever 38 or 39 in order to apply the required pressure. In this way, no adjustment of the notching tool to the respective transition area to which pressure is to be applied is necessary, but it becomes simple actuates the notching tool which is opposite the transition area to which pressure is to be exerted in order to bring the gap centers of the two magnetic heads to the same level. In the present case, the notching tools are designed in the form of blades and extend essentially across the entire transition areas. Of course, it would also be possible to design the notching tools in such a way that notching effects occur only locally, for example at some points of the transition area in question.

Nachdem auf diese Weise die Spaltmitten der beiden Magnetköpfe 11 und 12 auf gleiches Niveau gegenüber der die Bezugsfläche bildenden Seitenfläche 17 des Basisteiles 8 des Trägerplättchens 6 gebracht wurden, wird das Trägerplättchen mit der vorgenannten Bezugsfläche der Kopfscheibe 4 zugewandt an dieser befestigt, wie dies Fig.7 zeigt. Die Befestigung wird dabei so gewählt, daß sie in einem im wesentlichen von den Lappen 9 und 10 abgewandten Bereich des Basisteiles 8 des Trägerplättchens 6 erfolgt, damit der verbleibende Abschnitt des Trägerplättchens nicht festgehalten ist. Im vorliegenden Fall geschieht diese Befestigung mit einer Schraube 40, die durch eine Bohrung 41 im Basisteil 8 des Trägerplättchens 6 hindurchragt und in eine Gewindebohrung 42 an der Kopfscheibe 4 eingreift. Hiebei ist zur Freistellung der Magnetköpfe 11 und 12, der diese tragenden Lappen 9 und 10 sowie des diesen Lappen 9 und 10 im wesentlichen zugewandten Bereiches des Basisteiles 8 des Trägerplättchens 6 in der Kopfscheibe eine Ausnehmung 43 vorgesehen, so daß diese Teile frei auskragen.After the gap centers of the two magnetic heads 11 and 12 have been brought to the same level in relation to the side surface 17 of the base part 8 of the carrier plate 6 forming the reference surface, the carrier plate is attached to the aforementioned reference surface of the head plate 4, as shown in FIG. 7 shows. The attachment is chosen so that it takes place in a region of the base part 8 of the carrier plate 6 which essentially faces away from the tabs 9 and 10, so that the remaining section of the carrier plate is not held in place. In the present case, this fastening takes place with a screw 40 which projects through a bore 41 in the base part 8 of the carrier plate 6 and engages in a threaded bore 42 on the head plate 4. Hiebei a recess 43 is provided in the head plate for exempting the magnetic heads 11 and 12, the flaps 9 and 10 carrying these and the flaps 9 and 10 essentially facing this region of the base part 8 of the carrier plate 6, so that these parts project freely.

Nach dieser Montage des Trägerplättchens 6 an der Kopfscheibe 4 befinden sich somit die Spaltmitten der beiden Magnetköpfe 11 und 12 auf einem Niveau im Abstand b, von der die Bezugsfläche bildenden Seitenfläche 17 des Basisteiles 8 des Trägerplättchens 6, die mit der seitlichen Begrenzungsfläche 44 der Kopfscheibe 44 zusammenfällt, an der das Trägerplättchen 6 befestigt ist. Es sei nun angenommen, daß das gegenüber der Kopfscheibe 4 vorgegebene Niveau, auf welches die Spaltmitten der beiden Magnetköpfe 11 und 12 justiert werden sollen, im Abstand d von der seitlichen Begrenzungsfläche 44 der Kopfscheibe 4 liegen soll, wie dies in Fig.7 angedeutet ist. Hiezu ist an der Kopfscheibe 4 eine in einer Gewindebohrung 45 verdrehbare Justierschraube 46 vorgesehen, die mit ihrem freien Ende mit dem im wesentlichen den Lappen 9 und 10 zugewandten Bereich des Basisteiles 8 des Trägerplättchens 6 zusammenwirkt. Auf diese Weise sind bei Betätigung der Justierschraube 46 durch Verbiegen diese Bereiches des Basisteiles 8 des Trägerplättchens 6, wobei auch die beiden Lappen 9 und 10 gleichförmig mitverstellt werden, beide Magnetköpfe gemeinsam mit ihren Spaltmitten auf das im Abstand d von der seitlichen Begrenzungsfläche 44 der Kopfscheibe 4 liegende vorgegebene Niveau justierbar. Wie ersichtlich, ist somit nur eine Justierschraube 46 erforderlich, die mit dem gegenüber den Lappen 9 und 10 breiteren Basisteil 8 des Trägerplättchens 6 zusammenwirkt, was einfach und ohne Platzschwierigkeiten zu realisieren ist.After this mounting of the carrier plate 6 on the head plate 4, the gap centers of the two magnetic heads 11 and 12 are thus at a level at a distance b from the side surface 17 of the base part 8 of the carrier plate 6 forming the reference surface, which is in contact with the lateral boundary surface 44 of the head plate 44 coincides, on which the carrier plate 6 is attached. It is now assumed that the predetermined level relative to the head disc 4, to which the gap centers of the two magnetic heads 11 and 12 are to be adjusted, should be at a distance d from the lateral boundary surface 44 of the head disc 4, as is indicated in FIG . For this purpose, one is in one on the head disc 4 Threaded bore 45 rotatable adjusting screw 46 is provided, which cooperates with its free end with the area of the base part 8 of the carrier plate 6 essentially facing the tabs 9 and 10. In this way, when the adjusting screw 46 is actuated by bending this area of the base part 8 of the support plate 6, the two tabs 9 and 10 also being adjusted uniformly, both magnetic heads together with their gap centers on the at a distance d from the lateral boundary surface 44 of the head plate 4 lying predetermined levels adjustable. As can be seen, only one adjusting screw 46 is required, which interacts with the base part 8 of the carrier plate 6, which is wider than the tabs 9 and 10, which can be implemented easily and without space problems.

Das Wesentliche des vorliegenden Verfahrens besteht somit darin, daß zuerst die Spaltmitten beider Magnetköpfe auf gleiches Niveau gegenüber einer Bezugsfläche des Trägerplättchens gebracht und anschließend, nach der Befestigung des Trägerplättchens an der Kopfscheibe, mit einer Justierschraube gemeinsam auf das vorgegebene Niveau gegenüber der Kopfschiebe justiert werden.The essence of the present method is thus that first the gap centers of both magnetic heads are brought to the same level with respect to a reference surface of the carrier plate and then, after the carrier plate has been fastened to the head plate, are adjusted together with the adjusting screw to the predetermined level relative to the head slide.

Claims (1)

  1. A method of adjusting the gaps (30, 33) of two magnetic heads (11, 12) arranged on one head disc (4), which heads are disposed adjacent one another in one plane and are arranged on the head disc (4), which is rotatable in operation, by means of a common supporting plate (6), one end portion of the supporting plate (6) being provided with a slot (7) to form two limbs (9,10) which project from a basic portion of the supporting plate and whose free ends each carry one of the two magnetic heads (11, 12) arranged on the same main surfaces of the limbs (9, 10), the supporting plate (6) being secured to the head disc (4) with its basic portion after which the head-width-related gap centres of the two magnetic heads are adjusted to a predetermined level relative to the head disc, characterized in that the distances between the head-width-related gap centres of the two magnetic heads (11, 12), which heads are arranged on the limbs (9, 10) of the supporting plate (6), and a main surface of the basic portion of the supporting plate, which main surface constitutes a reference surface and corresponds in level to the main surfaces of the limbs (9, 10) of the supporting plate (6) which carry the magnetic heads (11, 12), are measured to determine the magnetic head with the smaller distance, after which the basic portion of the supporting plate (6) is fixed and a notching tool (36) exerts a pressure on the transition between the limb carrying the magnetic head with the smaller distance and the basic portion of the supporting plate from the side which is remote from the magnetic head (11) to permanently offset substantially the entire limb (9) by plastic deformation until the head-width-related gap centre of the magnetic head (11) on said limb is situated at the same level as the head-width-related gap centre of the magnetic head (12) on the other limb, in that subsequently the supporting plate (6), with the main surface of the basic portion which constitutes the reference surface facing the head disc (4), is secured to the head disc (4) in the area of the basic portion which is substantially remote from the limb (9, 10), after which by means of a set-screw (46), which acts between the area of the basic portion of the supporting plate (6) which substantially faces the limbs (9, 10) and the head disc (4), said area of the basic portion of the supporting plate (6) is bent to adjust the head-width-related gap centres of both magnetic heads (11, 12) together to the predetermined level relative to the head disc (4).
EP87202453A 1986-12-10 1987-12-09 Method for adjusting the gap of two magnetic heads arranged on a head wheel, and head wheel with two magnetic heads arranged on it Expired - Lifetime EP0271167B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0327886A AT388823B (en) 1986-12-10 1986-12-10 METHOD FOR ADJUSTING THE GAP OF TWO MAGNETIC HEADS ARRANGED ON A HEAD WASHER, AND HEAD WASHER WITH TWO MAGNETIC HEADS ARRANGED ON ITS HEAD
AT3278/86 1986-12-10

Publications (3)

Publication Number Publication Date
EP0271167A2 EP0271167A2 (en) 1988-06-15
EP0271167A3 EP0271167A3 (en) 1990-05-23
EP0271167B1 true EP0271167B1 (en) 1993-11-03

Family

ID=3548113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87202453A Expired - Lifetime EP0271167B1 (en) 1986-12-10 1987-12-09 Method for adjusting the gap of two magnetic heads arranged on a head wheel, and head wheel with two magnetic heads arranged on it

Country Status (8)

Country Link
US (1) US4897745A (en)
EP (1) EP0271167B1 (en)
JP (1) JP2713407B2 (en)
KR (1) KR960013770B1 (en)
AT (1) AT388823B (en)
CZ (1) CZ280746B6 (en)
DE (1) DE3788046D1 (en)
HK (1) HK163995A (en)

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JPH02149908A (en) * 1988-11-30 1990-06-08 Victor Co Of Japan Ltd Double azimuth magnetic head
JP2718137B2 (en) * 1989-01-31 1998-02-25 ソニー株式会社 Magnetic head
JP2520613Y2 (en) * 1990-06-05 1996-12-18 ソニー株式会社 Magnetic head base
JPH0444613A (en) * 1990-06-11 1992-02-14 Sony Corp Magnetic recording and reproducing device
US5065267A (en) * 1990-07-20 1991-11-12 Matsushita Electric Industrial Co., Ltd. Multi-track magnetic head having different height head chips
US6014286A (en) * 1990-12-19 2000-01-11 Kabushiki Kaisha Toshiba Magnetic head having a die-molded conductive resin head base
JPH04358315A (en) * 1991-06-05 1992-12-11 Sony Corp Rotary head device
JPH052725A (en) * 1991-06-27 1993-01-08 Sony Corp Rotary head drum device
JPH0714132A (en) * 1993-06-28 1995-01-17 Hitachi Ltd Rotary magnetic head device and production thereof and producing device therefor
JPH07240016A (en) * 1994-02-24 1995-09-12 Sony Corp Magnetic head and production of magnetic head
JPH0896540A (en) * 1994-09-28 1996-04-12 Fujitsu Ltd Magnetic disk device and head assembly
KR200153814Y1 (en) * 1994-12-27 1999-08-02 전주범 Head mounting structure for a head drum assembly
KR100212557B1 (en) * 1996-12-30 1999-08-02 전주범 Video head of head drum
CN102554551A (en) * 2011-12-07 2012-07-11 芜湖普泰汽车技术有限公司 Adjustment method for eliminating fit tolerance of surface size of aluminum model

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Also Published As

Publication number Publication date
CS8709038A2 (en) 1991-08-13
ATA327886A (en) 1989-01-15
DE3788046D1 (en) 1993-12-09
AT388823B (en) 1989-09-11
CZ280746B6 (en) 1996-04-17
HK163995A (en) 1995-10-27
US4897745A (en) 1990-01-30
KR960013770B1 (en) 1996-10-10
JPS63152013A (en) 1988-06-24
EP0271167A3 (en) 1990-05-23
EP0271167A2 (en) 1988-06-15
JP2713407B2 (en) 1998-02-16
KR880008244A (en) 1988-08-30

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